I said:
You said:

I said "Door closed - light ON.
You said "Door closed - light OFF - is not what's needed.

I think the TS wants to know when the trap is sprung - i.e. trap door closed - with an indicator light indicating the trap has been sprung. Door closed - trap sprung - light ON. All this is one event, a sprung trap.

No, that is not what the TS required, despite what you think.

How many different ways can I explain this?

In a set trap, that an animal has yet to trigger, the door is closed. In a sprung trap, the door is also closed. How are you going to differentiate between the two states?

A light has to come on and stay on when the door MOMENTARILY opens and returns to the closed state.

This is how this type of trap operates. I have included a link previously to demonstrate this type of trap in use.

 

In a set trap, that an animal has yet to trigger, the door is closed.

If the door is closed then how does the animal get into the trap ? ? ?

 

If the door is closed then how does the animal get into the trap ? ? ?

Follow my link and find out.

The door is a counter weighted trap door. Bait is sprinkled on the top. A rat walks out along the door, and his weight opens the door and the rat falls in. The counter weight then returns the door to the closed position, ready for the next rat

 

The only trap I can think of with a closed door is one with a swinging one way door. The target enters the trap by pushing the door open. Then when the door is cleared the door swings closed again. HOWEVER; the TS has a solenoid activating the door. So for the target to get into the trap the door must be open, like so many other traps. When the trigger is tripped the door swings and locks closed, trapping the target. The TS is using some kind of trigger to trip the solenoid that traps the target. So the door must be open for the animal go get in. Hence, an open door prevents a light from lighting. When the trap is sprung the door closes and turns the light on.

I think we need to hear from the TS for clarification on this.

 

The TS hasn't commented since November 17. I have no desire to further belabor these points. If the TS has a solution then what are we solving? Unless the TS responds - I'm going to withhold commenting further.

 

There is those teeter toter type commercial traps that work from the animals weight then they reset themselves.
(I am, of course presuming y'all are talking about a real animal trap)

 

This thread has been filled with guesses and assumptions and conclusions based on not based on what the TS had asked about. No wonder the TS has not returned.
What became obvious is that whatever the TS was using was quite different from what others were familiar with, and it functions differently from the standard arrangements, thus a different indicator system was needed.
Unfortunately that fact has been totally ignored by quite a few participants.